[jj12]

I think this play is perfect if he bet/calls w/ TPWK. If he folds it I don't like it.

If you think he folds like A7o then I would just c/c river. I don't think donks like slowplaying 2 pair on flops like this because there are str8 and flush draws. So you have to decrease the weight on 89 type hands. He def. bets A9o on the flop and probably A8 as well. So I think by the river most of his range is like:
Ax that spiked on the turn,
T7 and 57 that he is slowplaying
and retarted bluff.
If I had to do some subjective weighting I think
Ax 30% (he probably has 2 pair like 5% here).
T7 and 57 20%
retarted bluff 50%.

against this range c/r is suicide unless he calls off like crazy